Does anybody have experience with QDataStream reading from QProcess or QFile.open(stdin,QIODevice::ReadOnly )? At the beginning I naively thought that it just works cross platform. Looking closer, it does not seem so obvious, see also [1][2]. What I am observing (currently on Linux) is that if there are no data on the device, reading from QDataStream is not blocked until data are available, it sets an error and continues. In theory, the underlying QIODevice::readData should block, Qt doc states:
"When reimplementing this function it is important that this function reads all the required data before returning. This is required in order for QDataStream to be able to operate on the class. QDataStream assumes all the requested information was read and therefore does not retry reading if there was a problem." I looked briefly into QProcess code and it seems to be blocking, unfortunately in practice it is not. Am I missing some options, mode settings? Do I have to write my blocking QIODevice subclasses? Radim [1] http://stackoverflow.com/questions/19681564/read-from-qtcpsocket-using-qdatastream [2] http://lists.qt-project.org/pipermail/interest/2012-May/002110.html _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
